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Finding the Fourth Proportional to 910.60, 1,255.62 and 890.56

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Solution

The fourth proportional to 910.60, 1,255.62 and 890.56 is: 1,227.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.60 : 1,255.62 = 890.56 : x
  2. Step 2: Convert to fraction form
    910.60/1,255.62 = 890.56/x
  3. Step 3: Cross multiply
    910.60x = 1,255.62 × 890.56
  4. Step 4: Simplify right side
    910.60x = 1,118,204.95
  5. Step 5: Solve for x
    x = 1,118,204.95/910.60
  6. Step 6: Final answer
    x = 1,227.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.